Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Activities:
Net Income	$ 112,587	$ 98,547
Items not affecting cash:
Depreciation and amortization	84,848	80,636
Deferred income taxes	4,784	170
Provision for doubtful receivables	6,600	6,600
Employee benefit plan (credit) cost	(3,697)	424
Equity earnings in investments	(9,586)	(8,427)
Other items	(3,011)	1,247
Changes in working capital items:
Current assets	18,090	27,544
Accounts payable	(396)	(11,699)
Deferred income taxes	0	7,146
Other current liabilities	2,487	2,120
Dividends from investments	8,411	6,414
Cash contributions to pension and other postretirement plans	(5,678)	(5,511)
Other noncurrent items, net	13,331	4,625
Cash Provided by Operating Activities	228,770	209,836
Investing Activities:
Capital expenditures	(255,622)	(164,064)
Capital contributions to investments	(9,208)	(4,348)
Other	2,984	801
Cash Used for Investing Activities	(261,846)	(167,611)
Financing Activities:
Issuance of common stock, net	3,750	2,591
Cash dividends paid on common stock	(50,230)	(47,210)
Repayments of long-term debt	(3,951)	(3,847)
Proceeds from short-term debt	74,000	10,500
Other	(969)	(879)
Cash Provided by (Used for) Financing Activities	22,600	(38,845)
Change in cash, cash equivalents, and restricted cash	(10,476)	3,380
Cash, cash equivalents, and restricted cash at beginning of period	24,496	15,026
Cash, cash equivalents, and restricted cash at end of period	14,020	18,406
MGE [Member]
Operating Activities:
Net Income	104,037	93,064
Items not affecting cash:
Depreciation and amortization	84,848	80,636
Deferred income taxes	4,083	387
Provision for doubtful receivables	6,600	6,600
Employee benefit plan (credit) cost	(3,697)	424
Other items	595	1,911
Changes in working capital items:
Current assets	18,065	27,668
Accounts payable	(414)	(11,697)
Deferred income taxes	0	7,146
Other current liabilities	1,675	2,904
Cash contributions to pension and other postretirement plans	(5,678)	(5,511)
Other noncurrent items, net	11,868	3,171
Cash Provided by Operating Activities	221,982	206,703
Investing Activities:
Capital expenditures	(255,622)	(164,064)
Other	(1,371)	(1,447)
Cash Used for Investing Activities	(256,993)	(165,511)
Financing Activities:
Cash dividends paid to parent by MGE	(37,500)	(31,000)
Distributions to parent from noncontrolling interest	(11,500)	(16,000)
Capital contributions from parent	2,000
Repayments of long-term debt	(3,951)	(3,847)
Proceeds from short-term debt	74,000	10,500
Other	(969)	(879)
Cash Provided by (Used for) Financing Activities	22,080	(41,226)
Change in cash, cash equivalents, and restricted cash	(12,931)	(34)
Cash, cash equivalents, and restricted cash at beginning of period	20,059	6,705
Cash, cash equivalents, and restricted cash at end of period	$ 7,128	$ 6,671